They all do that, once you start supporting that frame and body structure by points on the frame instead of the car sitting on the suspension it’s a normal occurrence.
Same thing but worse with a convertible car, I can’t get the doors open on my Le Mans if I support it under the front frame rails and at the rear suspension mount area. Even that heavy duty boxed frame can’t stop the flexing.
Hardtop cars are worse than post cars in this regard as well.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/3.08
2002 WS6 Convertible LS1/4L60E/3.23
1966 VW Type 2 Single Cab Pickup 140hp 2276
1956 VW Type 2 Panel Van 36hp 1200
1957 VW Type 1 Beetle 180hp 2276
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